Whayoung is glass noodle made from sweet potato starch. Whayoung using 100% quality sweet potato starch produced in Korea. Whayoung glass noodle is firmer and more elastic in texture. It contains no alum, chemical compound used to keep color and elasticity consistent, haying is used as main ingredient for a very popular Korean dish, "Japchae" (stir fried glass noodle).